Dual purpose pump



E. E. WETTLEY DUAL PURPOSE PUMP Nov. 9, 1954 3 Sheets-Sheet 1 Filed June8, 1949 INVENTOR. mew/lard F wezi'l ciz N v- 9, 1954 E. E. WETTLEY DUALPURPOSE PUMP 3 Sheets-Sheet 2 Filed June 8, 1949 INVENTORJ mew/Lard Z.We

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NOV. 9, 1954 WETTLEY 2,693,768

DUAL PURPOSE PUMP Filed June 8, 1949 3 Sheets-Sheet 3 United StatesPatent DUAL PURPOSE PUMP Eberhard E. Wettley, Chicago, 111.

Application June 8, 1949, Serial No. 97,744

30 Claims. (Cl. 103-207) This invention relates to a manually operabledual purpose pump for high pressure fluid delivery to a fluid operatedmechanism and a pump that more specifically includes a second operativestage wherein the same pump functions to deliver a considerably largerfluid volume output to such fluid operated mechanism under low pressuredemand conditions.

Numerous so called two-speed pumps have been developed to cope with thisproblem, but all are either too complicated and costly, or they haveproven inefficient and impractical under actual operating conditions.The general trend has been to resort to dual cylinder structures havinga double piston arrangement, but the difficulty in these designs hasbeen to provide simple hand operated means therefor with suflicientmechanical advantage to be actually used with equal facility and ease tooperate both stages of the dual cylinder or other twospeed pumpsundernormal high pressure fluid demand conditions. The high pressurestages of such pumps are so limited under hand manipulation that powerdriven equipment has been resorted to to actually serve the purpose, andsuch equipment is of the type that is pressure responsive to the demandand not the kind which would b? suitable for manual work under the sameconditions 0 use.

It is one of the main objects of this invention to provide a pump thatis manually operable wherever needed to deliver fluid under highpressures to satisfactorily operate hydraulic or other fluid responsiveequipment in their designed capacities and which pump is selectivelyautomatically adapted to operate in a low pressure capacity to moverelatively large volumes of fluid under low pressure conditions.

Fluid or hydraulic equipment mechanisms usually require lost motionoperation before becoming effective to render service under highpressures. The result is that the hydraulic pump or pumps in any ofthese systems must operate at slow and time consuming intervals to movethe members of each system into positions wherein their actual functionsand purposes are ultimately rendered useful. By using a hand actuatedpump designed for high pressure delivery in such systems the operatormust spend much time and effort to move the parts acted upon by the pumpthrough the fluid operable means until such parts become effective. Andfor all intents and purposes the high pressure design of such a pump israther worthless as far as the low pressure manipulation thereof isconcerned during the lost motion cycle period of the connected hydraulicor fluid equipment.

Another object of this invention, therefore, is to provide a manuallyoperable pump that will actually serve in optimum capacity to move fluidunder high pressure conditions and which will have the facility to throwoff, so to speak, its normal high pressure function to effectivelyassume a rapid low pressure large fluid volume displacement cycle toquickly bring the coacting parts of a fluid system into operativepositions for subsequent and further action under a high pressure fluiddelivery cycle.

It is a further object of the present design to provide a singlecylinder pump having the dual purposes above related thus concurrentlysimplifying the structure for fabrication and at relatively low costproduction values.

A further object of the pump is to perform the dual purpose functionsthereof through reciprocatory and rotative piston actuating mechanism,both actions being accomplished by the use of hand operable means whichmanipulate the piston within the confines of the single 2,693,768Patented Nov. 9, 1954 cylinder structure. More specifically, thereciprocatory piston action produces the large fluid volume displacementat low pressures while the rotative action of the piston produces thelower volume and high pressure fluid displacement.

Other objects and advantages relating to the design of the dual purposepump of the present invention shall hereinafter appear in the followingdetailed description thereof having reference to the accompanyingdrawings forming a part of this specification.

In the drawings:

Fig. l is a front elevational view of the pump as the same would appearin one typical installation thereof to operate a fluid cylinder of amachinery hauling semi trailer supporting foot;

Fig. 2 is a side elevational view of the pump structure as mounted uponthe trailer with the latter in section substantially as viewed along theline 22 in Fig. 1;

Fig. 3 is a vertical axial cross sectional view through the pump properand the connected valves with the piston retracted to the top of itsstroke within the cylinder;

Fig. 4 is a similar cross sectional view of a fragmentary part of thepump illustrating the displacement feature of the piston when rotated toproduce high pressure fluid displacement;

Figs. 5 and 6 are vertical cross sectional views take transversely ofthe pump axis and as seen along the lines 5--5 and 6-6 respectively inFig. 3 and looking in the direction of the arrows;

Fig. 7 is a fragmentary detail view partially in section to show thepiston rod structure and its connection with the hand lever and pistonof the pump;

Fig. 8 is a plan view of the piston actuating cam as viewed from thecylinder nesting end thereof, such cam being constructed as a stampingand providing a separable pump part;

Fig. 9 is a cross sectional view of the stamped metal cam as viewedalong the line 99 in Fig. 8;

Fig. 10 shows a modified cylinder construction wherein the cam for thepiston comprises an integral part of the. cylinder head or cap;

Fig. 11 illustrates a solid cylinder with the cam cast or formedintegrally into the end thereof to permit the use of the cylinder per seas a screw cap separable from its supporting base;

Fig. 12 is a fragmentary axial sectional view of a modified cylinderstructure having a multipoint piston actuating cam which is designed tooperate a coacting cam piston under rotary actuation in either directionof rotation;

Fig. 13 is a cross sectional view of the cam end of the iyz linde' inFig. 12 as seen along the line 13-13 in Fig.

Fig. 14 is another modified pump structure illustrating a contemplatedvariation in the manual operable lever and pump operating mechanismwhich is readily applicable to any of the other pump designs hereindescribed and illustrated.

The pump shall be described as a hydraulic unit and obviously may beinstalled and operated for use in connection with any kind of a fluidsystem or fluid operated apparatus requiring a pump of this dual purposecharacter.

Figs. 1 and 2 depict a more specific installation of the pump 1 asapplied for manual operable use in connection with a semi-trailer 2having a hydraulically actuated supporting unit 3. The pump 1 comprisingthe device of the present invention has a cylinder 4 carried by a base 5to secure one end of the cylinder in a conveniently usable positionadjacent the apparatus served thereby, the cylinder 4 being closed atits other end by a head 6 as a screw cap adapted for assembly of thecylinder pump parts and to provide ready access to such parts and theinterior of the cylinder when necessary.

Base 5 includes flat apertured flanges 7 for bolts 8 to secure the basefirmly to a support such as the side channel 8a of the trailer 2. Thisbase 5 as best shown in Figs. 1, 2 and 3 further contains the pump checkvalves with the inlet valve shown at 9 and the outlet valve shown at 10,both valves being of conventional typesbut preferably quick acting largevolumetric capacity unitsv pressure operation.

to handle the maximum output of the pump without flow retardation andwithout placing added burden upon the operating mechanisms of the pump.

The fluid circuit is best shown in Figs. 2 and 3 with a fluid conduit 11connecting a fluid reservoir 12 with the inlet valve 9 of the pump1,while a fluid conduit 13 is connected with the outlet valve and leadsto one or more hydraulic cylinders 14 through suitable connectingconduits 15. Fluid from valve 9 enters the cylinder cavity 16 through abore 17 'and such fluid is discharged through a similar bore 18 to theoutlet valve 10. In this manner the supporting foot '19 of the trailer 2ma'y be moved a distance 20 to the ground by the ram 21 of the footcylinder 14. The hydraulic su portin unit 3 may be fixed to the trailer2 or swingably mounted thereon as indicated by the connecting 'trunnions22 to retract this gear when not in use. Suitable lockfmeans is usuallyemployed to hold the gear retracted or in vertical trailer raising orsupporting position. Since this structure forms no part of thisinvention such lock means are not shown and in her description is notdeemed necessary, which also applies to the remainder of the fluidcircuit operative to bypass the pump '1 and to provide means to lowerthe "trailer by fluid outlet from cylinders 14 and back to thereservoir. V

Fluid is moved through the cylinder 4 by means of a fpis'to'n 23 secured'to a piston rod 24 that rides in an opening 25 in the screw cap head 6of the pump. The

piston ,23 may employ the usual cup seal 26 and one or more fluid rings27 to prevent fluid bypass or leakage "tothe rear of the piston. Therear of the body of the piston 23 terminates in a pair of contiguousradially disposed cams 28 and 29 of predetermined pitch and helical innature 'to formbilateral screw means for high Such cams 28 and 29 arebest shown in Figs. 3, 4, and 6, and these cams coact with anotherpairof complementary contiguousradiall'y dis- -posed 'ca'ms3l) and 31formedfupon a suitable stamping 32 terminating in a peripheral flange 33that is sandwiched between the outer end 34 of the cylinder 4 and theinner face 35 of the screw head 6. The cam stamping 32 is thus fixed tothe cylinder 4 and has an aperture 36 which permits the piston rod 24 topass 'therethrough to actuate the piston 23.

It should also be noted that the high points of each of the pairs of'coacting cams "are preferably beveled as shown at 37 on the pistoncamsfa'nd at 38 on the'cylinder 'cams. These coa'cting bevels 37-37 and3838 will cause a momentary pressure drop and fluid reversal in"the'cylinde'r immediately prior to the drop'oifsteps 39 on "the pistoncams and '40 on thecylinde'r earns, the 'coac'tin'g cams being wellshown in Fig. 4 as positioned upon the receding bevels'of the cams priorto the seating or nesting of the cams under a spring action mechanism tobe -dea scribed, the separation of the cams having been induced byrelative rotation of the piston with respect to the fined cylinder earn.V

I The spring faction mechanism for holding the cam sets 28*29 a d 30-41in cooperative contact is best described with reference to Figs 1-, 2, 3and 7. In Fig. '7 the 'pist'o'n'rod 24 'isshown with a squared end 41seated in a square opening 42 in the piston 23 with the shoulders =43 onthe round portion "of the piston red '23 abutting the 'face'of thepiston adjacent thesq'u'are opening therein. The squared rod end 41 maybe held socketed in piston 23 by suitable fastening means such as a 'nut'44 threaded upon the reduced stud 45 of the rod 24, and the other partsof the piston including the cup seal 26 are also se- ='cu'red "tothepiston by the same fastening means. :mampurpos'e of this structure is tounify theipiston and the 'rod whereby these elements maybe consideredintegra l for all intents and .purposes to thus insure that the pistonmov'em'ent's strictly follow the rod movement's.

The other end "of the piston rod 24 is -squared at 46 and rides in asquare opening 47 in a block"48 that has aligned studs 49 and 50positioned to pass through "slots '51 and 52 respectively formed inopposite legs 53 and 54 of a composite lever 55 shown Figs. 1 and 2.

Washers E6 and cotter pins 57 are -car'rie'd by the studs 49 and '50 to'ree'nfor'ce this structure-at this poin't although the opposite studfaces "of block 48 'agains't'theadjacent 'legfaces will normallyrevent=cpcking of "the block and studs within the lever opening 58formed by th'e ofiset's 59 and 60 m :legs 53 and 54 of the -lever 55.

A head 61 is secured to the end of the-rod 24 a'nda The spring 62 isconfined between said head and the block 48. Spring 62 normally urgesthe rod 24 to the left as viewed in Fig. 7, thereby holding theshoulders 63 of the round portion of rod 24 in'abutting contact with theadjacent face of the block 48. Spring 62 may be of such selectedstrength to normally hold the parts in the relationship illustrated withthe functional capacity to permit movement of rod 24 relative to theblock 48 and lever 55 under one set of conditions of operation of thepiston and pump.

Lever 55 is composite as noted by using symmetrical halves of formedmetal bars 'contn'arising the legs 53 and 54. Legs 53 and 54 aresecu-red together by rivets 64 above block 4 8 and by at least oneshouldered stud rivet 65 below the block todispose the lower .ends oflegs 53 and 54 in spaced relation to each other to receive an arm 66 ofa rotary bracket 67 therebetween. Both lower ends of the legs 53 and 54of the lever 55 are pivotally mounted at 63 to arm 66 of the bracket67thus providing the operational supporting means that positions :lever 55in operative relation to the pump. The opposite :upper end of the lever55 is angled at 69 to receive a rotational hand sleeve 7% thereon, andboth the arm end 69 and sleeve 76 are positioned substantiallyhorizontally or parallel to the pump axis when the pump parts are in thefull line retracted positions indicated in Fig. 2.

.Referring to the rotary bracket =67 as best shown in Figs. 2, 3 and 5,arm '66 has an oifset 7-1 that terminates in a band bearing 72 which is:rotatively mounted upon the "cylindrical wall of thepump cylinder 4.This bracket band bearing 72 could be adjustably secured to thecylinde'r '4, out in the construction here used a sleeve 'or'col' lar 73is fastened to the cylinder 4 by one or more set screws 74 and in alocation wherein the band bearing 72 abuts the shouldered screw head 6,the latter and the collar thus forrninga peripheral channel within whichthe bracket 67 may be bodily rotated about the :longitudinal axis of thepump 1 under which conditions the lever 55 is also bodily rotated aboutthe aligned axesof the pump 1 and block 48.

The operation of the pump involves two separate actions which may bedefined as reciprocatory and "rotational, both, however, being solelyconfined to the cavity 16 of the single cylinder 4 and both utilizingthe'single :piston 23 as the main fluid displacement means under the lowand high pressure cycles "of the device. During the period requiringfluid displacement under low pressure conditions for taking up the lostmotion of the fluid actuated mechanical parts acted upon by the pump 1,as in the case Where ram 21 in Fig. 2 must be advanced a distance 20before becoming eflective in its designed capacity, the pump is thenactuated as a reciprocatory pump. lever 55 is grasped by the :hand belowthe sleeve and beneath the angle portion 69 and is moved arcuately backand forth about the pivotal means 6-8 'as show-n in -Fig. 2 by the fullline and broken line positions. With the use of a stud and slotstructure for joining the block 48 and lever 55, a fixed pivotal meanssuch as 68 is feasible. Also, spring 62 will actto return the rod 24 andpiston 23 holding 'shoulders63 of the rod 24against the block 48, and onthe power stroke the block 48 will automatically maintain its abuttingrelation to the rod shoulders=63 urging the piston the full length of"cylinder 4 moving the 'entire fluid slug out of valve 10 to :thehydraulic equipment. Cylinder l refills "completely-under the nextretraction of the'pist'o'n by drawing fluid from the reservoir 12through valve 9. I

After the foot 1 9 rea'ches the ground -the fluid demand pressureincreases sharply and hand reciprocation of lever '55 is automaticallyhalted. This stage is easily detected by 'th'e operator since theresistance of the piston and connected parts against the lever 55 willprevent -further forward manipulationth'ereof. When this occurs,the'pist'on earns 28 and 29 will be in cooperative-contact With-thefixed cylinder cams 30 and 3 1. The-'operator'may now shift his handfrom the lever 55 to the hand sleeve 70 and swing the lever in aclockwise direction'through the are shown by the arrows in Fig. l,bodily rotating'piston '23 upon its axis within the cavity 16 ofthecylinder -4 and about the long 'axis of the pump. With thedual camarrangement, the piston 23 will be actuated 'f orwardly in the cylindertwice each complete revolution of the lever 55 and each'time by anamount equal to the maximum rise of the cams utilized. Spring "62 willre tract the piston quickly "at the completion'of each 'ca'rn-controlled forward stroke of the piston. Since the rotary action israpid and the drop off of the cams rather instantaneous, the bevels37---37 and 3838 provide a split second reversal in fluid pressurewithin the pump to give the check valves 9 and 10 an opportunity to openand close respectively for quick fluid intake through valve 9 with thesimultaneous entrapment thereof by valve 10. Each next successive powerstroke by revolution will force a relatively large amount of fluid outof the same bore of the cylinder for approximately one half of a turn oflever 55, part ofthe half revolution being absorbed by the bevels whichoperative stage actually belongs to the intake stroke of the pump. Thehigh pressure cam action stroke is well shown in Figs. 3 and 4.

In passing from low pressure stage to the high pressure stage the leverfunctions initially as a lever and secondarily as a crank. The separablecams provide means to build up considerable power on the pistonlongitudinally of the cylinder. The mechanical advantage obtainable by aselected given lever length acting substantially closely to orcoincident with the axis of rotation of the cams that'hug their axes ofrotation is unlimited.

Suitable conventional venting means may be used to the rear of thepiston 23 if necessary to prevent air lock or resistance. In theconstruction shown enough venting may be had through the opening 36 (seeFigs. 8 and 9) through the stamping 32 here illustrated and through thebore 25 in the head 6. If further venting is needed, one or more ventholes 75 maybe made in the stamping 32 to bypass air through one or morevents 76 drilled through the head 6.

The spring mechanism described and indicated in general at 77 in Fig. 2will permit lever 55, as a crank,

to be swung through its arc of operation without being subjected to thejiggling of the rod 24 and its piston 23. The experience of the operatorwill supplement the lost motion action at the connection of the pistonrod to the lever. With a modified construction it is possible to lockthe lever for use as a crank during the high pressure demand stage ofthe pump. Such a scheme is illustrated in Fig. 14 wherein arm 66 mayhave a segmental extension 78 with a suitable hole therein for alignmentwith a hole or holes 79 in the adjacent lever part or parts for thereception of a locking pin or the like. In addition, the band bearing 72may have a second arm 80 positioned to ride between the lever legs thatare here additionally offset upwardly at 81 to receive such armtherebetween. A pin 82 may be used .to lock lever 55 to the arm 80 byinsertion through suitably arranged openings in said arm and lever.

With either of the dual means shown in Fig. 14, it is possible tostabilize the position of the lever relative to the pump when the leveracts in the capacity of a crank during the high pressure cycle of thepump. The other parts will function in the same manner as in the firstdescribed device.

Attention is directed to the mounting of lever 55 in the structuresillustrated in Figs. 2 and 14. The lever is made to straddle the arm 66of the rotative bracket 67 to guide the lever in a plane radiallydisposed with respect to the pump axis to relieve the extending pistonrod 24 of lateral stresses particularly when the lever is used as acrank. And whether arm 80 is used for locking purposes or not, the samedoes act in the capacity to further hold lever 55 in its operative planewith respect to the pump under either the reciprocatory or rotativestages of operation of the pump.

It should be noted that the reciprocation of the pump may be performedin any position of the 360 degrees about the pump axis. It may also betrue that the piston and cylinder cams may not be lined up to nest fullywhen the pump is used as a reciprocation pump. But a rotational reversalof the lever in the opposite direction from the normal cam strokerotation will align the cams so that manipulation of the handle or leverwill give the piston its full stroke operation within the cylinder.Movement of the lever in the normal operative crank actuation directioncan also be used to line up the cams to nest by listening to the snap ofthe cams into nested position. Continuing with the swing-- ing of thehandle or lever to reciprocate the piston will thereafter also yield afull stroke of fluid. Generally, whether the cams are fully nested ornot is not objectlonable particularly when considering the largecapacity of the pump under the low pressure cycle In the forms describedthe crank or high pressure cam stage is only performable underunidirectional op eration of the lever 55 due to the shape of the camsused. Figs. 12 and 13 show a pump of the same character using multipointcoacting cams 83 and 84 connected with the cylinder 85 and piston 86respectively. These cams are each designed with two high, points 87-87and two low points 88-88 with the continguous joining cam surfacesrising and falling in each degrees of the 360 degrees of cam surface.This elimi nates the vertical drop off and obviously lengthens the timeof the intake cycle. Furthermore, this provides symmetrical cams whichallow axial rotation of the piston 86 in either direction by lever 55 tocarry on the high pressure stage operation of the pump in the samemanner as the first described pump.

Figs. 10 and 11 have been inserted to show the varia tions possible inproviding the cylinder cam arrangement. In Fig. 3, the cylinder camcomprises the stamping 32 portrayed in Figs. 8 and 9 constituting aseparable member securable into the cylinder by the joining screw head6. Fig. 10 shows the cam 89 as cast or formed integrally with the head90 to be screwed into place upon the cylinder 91. Fig. 11 shows a cam 92cast or formed as an integral part of the cylinder 93 having a threadedend 94 for screw attachment at 95 with a threaded end 96 of a suitablebase 97 which is provided with inlet and outlet ducts 98 and 99 as inthe first described base 5. In the Fig. 12 structure, the head isintegral with cylinder 85' and cam 83 forms an integral part of the sameto provide a design using the same principle or" construction asindicatedin the Fig. 11 version of the pump.

There are other changes and variations possible and contemplated in thedual purpose pump structures disclosed and described herein Withoutdeparting from the fundamental concept of this invention. All suchmodifications and structural deviations shall, however, be governed bythe breadth and scope of the language of the appended claims that aredirected to the pump of this invention.

What I claim is:

1. In a pump, the combination of a cylinder, a piston therein,reciprocable means to bodily actuate said piston endwise within saidcylinder, and a second means to independently actuate said piston withinsaid cylinder comprising radially disposed cooperative means carried byopposed ends of said cylinder and said piston respectively, saidcooperative means being rendered operatively responsive under relativerotation between said piston and said cylinder.

2. In a pump, the combination of a cylinder, a piston therein, shiftablemechanism carried by said cylinder and connected with said piston tobodily actuate the latter longitudinally in said cylinder, and a secondmechanism to independently actuate said piston longitudinally in saidcylinder comprising radially disposed coacting means carried by opposedends of said cylinder and said piston respectively.

3. In a pump, the combination of a cylinder, a piston therein,reciprocable mechanism carried by said cylinder and connected with saidpiston to actuate the latter longitudinally in said cylinder, and asecond mechanism to also actuate said piston longitudinally in saidcylinder comprising radially disposed coacting means carried by opposedends of said, cylinder and said piston respectively, said coacting meansbeing operably responsive under relative rotation between said pistonand said cylinder, and one of the aforesaid mechanisms comprisingoperative means for inducing said relative rotation between said pistonand said cylinder.

4. In a pump, the combination of a cylinder member and a piston membertherein, said members being arranged for relatively longitudinalmovement along their common axis and for relatively rotatable movementabout said same common axis, operative means connected with one of saidmembers to relatively actuate said members along said common axis, andfurther radially disposed operative means connected with opposed ends ofboth of said members to relatively actuate said members rotatively abouttheir common axis and to also simultaneously actuate said membersrelatively to each other along the aforesaid common axis.

5. A pump comprising a cylinder, a piston disposed within said cylinderfor reciprocatory and/or rotational racemes movement :relative ;.to:said -.oy1inde.r,;and radiallyflisposed coacting cooperative meanscarried .by gopposed ends of :saidcylinder and'said piston to actuateJSEtidiPlSIOIl longitudinally of said cylinder during relative rotation:between said cylinder and piston, andoperative means con- .nected withsaid :piston to reciprocate the same within said cylinder independentlyof said cooperative means or to selectively induce relative rotationbetween said cylinder and said piston to simultaneously actuate :thelatter through said cooperative means.

'6. A pump comprising a cylinder unit,-a,piston :unit disposedwithingsaid cylinder unit for reciprocatory and/ or rotational movementrelative tovsaid :cylinder unit, .and r-radially disposed coactingcooperative means carriedby opposed-ends of said-cylinder unit andsaidpiston {unit to actuate said piston unit longitudinally of said-cylinderunit during relative rotation between :said units, and .operative meansconnected with one sO'f the :aforesaid units to cause relativereciprocation between said units independently of said cooperativermeansor to selectively induce relative rotation between said units to therebysimultaneously actuate the units relatively and ,longitudinally withrespect to each other through -.the aforesaid cooperative means.

7. A pump comprising a cylinder, a piston disposed 2 within saidcylinder for reciprocatory and/ or rotational movement relative to saidcylinder,,.radiallydisposed cooperative means carried by opposedendsof'said cylinder and said piston and arranged toactuatesaidpiston5longitudinally of said cylinder during relativerotation between said piston and cylinder, and a piston rod guided .bysaid cylinder and connected with said piston to reciprocate the latterindependently 'of said cooperative means and adapted to selectivelyinducerelative-rotation between said piston and said cylinder tolongitudinally actuate said piston in said cylinder through theinstrumentality of said cooperative means.

8. A pump comprising a cylinder, :a piston disposed within said cylinderfor reciprocatory and/or-rotational movement relative 'to said cylinder,cooperative :means carried by said cylinder and by said piston andarranged to actuate said piston longitudinally :of .said cylinder.duringlrelative rotation between saidrpiston andcylinder, a piston rodguided by said cylinder and-connected-with said piston to reciprocatethe latter independently of said cooperative means and adapted .toselectivelyinduce relative rotation between said piston'and saidcylinderto longitudinally actuate said piston in said cylinder through theinstrumentality ofsaid cooperativemeans,

a lever connected with said piston .-rod, and ,mounting v means tosupport said lever for swingable ,motion 'to .reciprocate said pistonrod including a-pivotal support for bodilyrotation of said levertorotatesaid piston-rod and to actuate'said piston by said cooperativemeans.

'9. A pump comprising-a cylinder, a piston'therein a piston rod carriedbysaid cylinder and connected 'to actuate said piston, a leverconnectedwith said rod, a bracket to pivotally support said lever-toreciprocate said piston rod and the piston longitudinally.tosaid-cylinder, said bracket having pivotal connection withsaid'cylin- .der to bodily rotate said lever and the connected rod andpiston about the axis of said cylinder, andcooperavtive means interposedbetween said cylinder and said piston to longitudinally actuate thepiston within said cylinder upon relative rotation between'said pistonand cylinder by said lever.

10. A pump comprising a cylinder, a piston therein, a piston rod carriedby said cylinder and connected to actuate saidpiston, a lever connectedwith said rod, a bracket to pivotally support said lever to reciprocatesaid piston rod and the 'piston longitudinally to said cylinder, saidbracket having pivotal connection with said cylinder to bodily. rotatesaid lever and the connected .rod and-piston about the axis of saidcylinder, and cooperative means interposed between said cylinder andsaid piston to longitudinally actuate thepiston within said cylinderupon relative rotation between said piston and cylinder bysaid lever,said cooperative means comprising coacting cams carried by said pistonand by said cylinder respectively.

11. A pump comprising a cylinder, apiston therein, .a piston rod carriedby said cylinder and connected .to actuate said piston, a leverconnected with saidrod, a bracket to pivotally support said lever toreciprocate, said ,piston .rod' and the .r piston longitudinally to,said cylinder,

said :hracket i'havingepivotal connection :with said cylinder :to:hodily :rotate said lever and the connected :rod and piston about theaxis of said cylinder, and cooperative means interposed between saidcylinder and said piston rto glongitudinally actuate the piston within,said cylinder ruponrelative rotation between said piston and cylinder:by said ,lever, said .cooperative ameans comprising coacting camscarried :rbyrsaid :piston;and :by said cylinder respec- .tively, said.cams veach having their effective coacting cam surface contoursdisposed operative :planes pozsitioned :generally sradially to the axisof said cylinder, and .said cams being .rendered :inedective during thereciprocation of said ,piston while being rendered fully eifectiveduring the .relative .rotationof said :piston with %respect to saidcylinder.

:L2. in a pump, in combination with a cylinder "and :a piston, a;leverconnected ;to reciprocate said piston, a bracketcarried 'by: saidcylinder for 'bodily rotation about Ithe axis :of the latter, pivotalmeans connecting :said lever with said-bracketstoipermitoscillationaofzsaid lever .in i-a direction Ito :reciprocate saidpiston, .and cooperative earn means connected with .a'fixed partiof saidcylinder :and .with said movable piston respectively .and arranged Itoiactuate .said .piston longitudinally 'of said cylinder :during relativerotation 'between said piston :and .cylinder by said lever and :therotatably mounted bracket.

113. xIna pump, in combination with a rcylinderanda .piston, a leverconnected to reciprocate said piston, a :bracketicarried by saidcylinderaforlbodily =T0t2lti0l'118b0llt the axis of :the -'latter,pivotal .means connecting said lever with said bracket to permitoscillation of said lever :in a direction ;to reciprocatersaid-piston,and coopera- .tive.:cam:means connected with'affixedpartuof said cylin-'der and .with said .movable'zpiston respectively and ar- :ranged:toactuate said piston longitudinally of said cylinzder during relativerotation between said piston and :cylinderbysaidlever and'tlre rotatablymounted bracket, said cooperative =cam means :being :located :at one end:of said cylinder and :upon aniadjacent :face of said piston:respectively;for operative :coaction when said piston .is .brought tosaid one end of said cylinder by said lever, and :resilient meansconnected with .said :piston to urge said cam means into operativecontact during bodily rotation :of said ;lever to thereby actuate .saidpiston through said cooperative cam ameans.

14. .In a :pump, :a cylinder, :a piston therein, :a :piston :rodconnected with said piston and projecting fror n one :CIld of saidcylinder, a bracket pivotallymounted upon said cylinder -.to revolve.about the axis 'of :the latter, a lever pivotally carried by saidbracket .to yoscillatetin any plane coincident :with the axis 10fsaidcylindenxoperative means 'for connectingsaid lever withisaidzp'iston ,rod to permit reciprocation of :Said :piston within .said,cylinder bysaid lever, and coacting cams carried at zone .end of saidcylinder and on an ,adjacent side :of .said piston and arranged to urgesaid .piston longitudinally .of said cylinder :by relative rotation ofthe piston with respect -to said ,cylinder, said jlever comprising meansto movesaid cams into operative contact and to :actuate .the same byrotating ,said piston with ;respect ;to said cylinder.

,15. -.In a;pump, .a cylinder, a piston therein, ;a piston .:rodconnected with said piston and projecting :from vone ,end :of ,saidcylinder, a bracket pivotally mounted .upon said cylinder to revolveabout the axis of "the .latter, a leverpivotally carried by said bracketto oscillate in any planecoincident with the axis of said cylinrder,operativemeans forconnecting said lever with said p1ston. rodto .permitreciprocation of said piston within said cylinder by said lever, andcoacting cams carried atone end -'of said cylinder and on'an 'adjacentsidexof said piston and :arranged to urge "saidpiston longitudinally ofsaid cylinder by relativerotation of the piston with respect to saidcylinder, said lever comprisingmeans to move isaidcams into operativecontact and to actuate thesame by rotatingsaid piston with respect tosaid .cylinder, and said .operative .means including resilientmechanism-to provide a lost motion connection between said leverandpiston rod to effectively join the latter .underdirectrreciprocation.of.said piston but'to permit relative movementbetween said lever and the piston ,rod :during rotation of the leverwhen said 'piston is actuated .by said coacting cams.

.16. .In a :pump, "a cylinder, a piston "therein, a rod for saidpistonrprojectingxfrom said cylinder, abracket carried upon saidcylinder to bodily swing about the axis of the latter, a lever pivotallycarried by said bracket for operation in the axial direction of saidcylinder, and operative means to connect the rod with said lever in linewith said cylinder to permit reciprocation of the piston by said lever,said cylinder and the piston having cooperative cam means at the rod endof the pump arranged to actuate said piston longitudinally in onedirection within said cylinder upon relative rotation between the pistonand cylinder by said lever and the rod, and spring means connected withsaid operable means to normally urge said rod in the other direction toretract said piston after cam actuation in the aforesaid one direction.

17. In a pump, a cylinder, a piston therein, a rod for said pistonprojecting from said cylinder, a bracket carried upon said cylinder tobodily swing about the axis of the latter, a lever pivotally carried bysaid bracket for operation in the axial direction of said cylinder, andoperative means to connect the rod with said lever in line with saidcylinder to permit reciprocation of the piston by said lever, saidcylinder and the piston having cooperative cam means at the rod end ofthe pump arranged to actuate said piston longitudinally in one directionwithin said cylinder upon relative rotation between the piston andcylinder by said lever and the rod, and spring means connected with saidoperable means to normally urge said rod in the other direction toretract said piston after cam actuation in the aforesaid one direction,said lever having a shank portion at its free end to provide a handgrasp to manually oscillate the lever for reciprocation of the piston,and said lever shank portion having a bent terminal end disposedgenerally parallel to the cylinder axis when the lever is retracted forcam actuation of the piston, said bent end forming a hand grip toconveniently rotate said lever and bracket about the axis of saidcylinder.

18. In a pump, a crank constituting a bent lever, a bracket to pivotallysupport said lever, a cylinder, said bracket being mounted for rotationon said cylinder and about the axis thereof, a piston, a rod connectedwith said piston and with said lever on the axial line of said cylinder,said lever comprising means to reciprocate said piston between certainlimits, operative cam means within said cylinder to actuate said pistonbetween certain other limits upon rotation of said lever in apredetermined plane of operation, and cooperative locking means carriedby said bracket and said lever respectively to position said bent leverin said operative plane for actuation of said operative cam means tomove said piston by the rotation of said bent leverQ 19. A pumpcomprising a cylinder, a piston, a first means to reciprocate thepiston, a second means to actuate said same piston within said cylindercomprising cooperative cams carried by the cylinder and the pistonrespectively and operable by relative rotation of the piston withrespect to the cylinder, said cams each comprising high and low pointsdisposed in the axial direction of the cylinder and adapted foralternate opposite engagement when rotated to urge the piston axially ofsaid cylinder in one direction, and resilient means connected with saidpiston to urge said cams into nesting contact in the opposite directionwithin said cylinder.

20. In a pump, the combination of a cylinder having fluid inlet andoutlet ports at one end thereof, a piston, actuating means toreciprocate said piston within said cylinder including coacting camscarried at the other end of said cylinder and by the pistonrespectively, said actuating means comprising a reciprocable memberconnected to move the piston through the full length of said cylinder,said member being rotatably mounted to induce relative movement betweensaid piston and said cylinder whereby said cams are rendered operativeto move said piston during the rotation of said member when the latteris held in retracted position at the cam end at said other end of thecylinder.

21. A pump comprising a cylinder, a piston, a first means to reciprocatethe piston, a second means to actuate said same piston within saidcylinder comprising cooperative cams carried by the cylinder and thepiston respectively and operable by relative rotation of the piston withrespect to the cylinder, said cams each comprising a plurality ofinclined planes terminating in abrupt drop-offs disposed in the axialdirection of the cylinder whereby said cooperative cams function to urgesaid piston axially of said cylinder in one direction, and resilientmeans connected with said piston to urge said cams together in theotherdirection within said cylinder.

22. A pump comprising a cylinder, a piston, a first means to reciprocatethe piston, a second means to actu-z ate said same piston within saidcylinder comprising cox operative cams carried by the cylinder and thepiston respectively and operable by relative rotation of the piston withrespect to the cylinder, said cams each comprising a plurality ofinclined planes terminating in abrupt drop-offs disposed in the axialdirection of the cylinder whereby said cooperative cams function to urgesaid piston axially of said cylinder in one direction, and resilientmeans connected with said piston to urge said cams together in the otherdirection within said cylinder, and said cams each having limitedportions of said inclined planes beveled adjacent to said drop-offs topartially reverse the direction of said piston in said cylin-" der underthe action of said resilient means immediately prior to the nesting ofsaid said cams at the drop-oif po sitions of the cams.

23. A fluid pump comprising a cylinder, a piston, a rod to reciprocatesaid piston the full length of said cylinder, an oscillatory memberconnected to reciprocate said rod, mounting means to support saidoscillatorymember in a given relation with respect to said cylinder andfor bodily rotation about the axis of said cylinder. and coacting camscarried by said cylinder and by said piston respectively to actuate saidpiston through a portion of the cylinder length upon rotation of saidpiston. and said rod through the instrumentality of said oscillatorymember.

24. A dual pressure fluid pump comprising a fluid cylinder having agiven length, a piston therein to negotiate the length of said cylinder,an actuating rod secured to said piston to bodily reciprocate the same,and coacting cam means interposed between said cylinder and said pistonto urge said piston lengthwise through a portion of said cylinder, saidcam means comprising a first cam connected with said cylinder with thecam surface portion thereof arranged to face said piston and a secondcam connected with the adjacent surface of said piston and having thecam surface portion thereof arranged to face said first cam, said pistonbeing bodily actuated through the length of said cylinder by endwisemovement of said rod, and said piston being partially actuated throughsaid cylinder by said cam means upon rotation of the piston by said rod.

25. A dual purpose pump comprising a cylinder, a piston member therein,an unrestrained rotatable and freely endwise movable actuating membercarried by said cylinder and connected with said piston member tomotivate the latter, and coacting bodily separable cam means carried onone of said members and secured in fixed relation on said cylinderrespectively. said piston member being endwise operable in said cylinderby rectilinear motion of said actuating member and also endwise operablein said cylinder by said cam means upon rotational motion of saidactuating member when said separable cam means are adjacentlypositioned.

26. In a fluid pump, a cylinder, a reciprocable mechanism comprising apiston in said cylinder and a rod for said piston slidably carried bysaid cylinder and being adapted to bodily reciprocate said pistonthrough out the length of said cylinder, and coacting cams carried atone end of said cylinder and upon an adjacent face of said pistonrespectively, said cams being rendered opera tive when said piston ispositioned adjacent said cam end of said cylinder, and said rodcomprising means to actuate said cams to move said piston along aportion of the length of said cylinder upon rotation of said piston bysaid rod.

27. In a fluid pump, a cylinder, a reciprocable mechanism comprising apiston in said cylinder and a rod for said piston slidably carried bysaid cylinder and being adapted to bodily reciprocate said pistonthroughout the length of said cylinder, and coacting cams carried at oneend of said cylinder and upon an adjacent face of said pistonrespectively, said cams being rendered operative when said piston ispositioned adjacent said cam end of said cylinder, said rod comprisingmeans to actuate said cams to move said piston along a portion of thelength of said cylinder upon rotation of said piston by said rod, andautomatic biasing means connected with said reciprocable mechanism tonormally urge that mechanism in a direction with respect to saidcylinder so as to bring said cams into cooperative relation.

28. A dual pressure fluid pump comprising a casing, a plunger in saidcasing, a push rod for said plunger slidably carried in one wall of saidcasing and being adapted to bodily reciprocate said plunger throughoutthe length of said casing under certain fluid pressure conditions, andcam members associated with one end of said casing and with said plungerrespectively, said casing cam member being arranged to surround saidpush rod and to face inwardly of said casing, and said plunger cammember being connected with said rod and arranged adjacent one face ofsaid plunger surrounding said push rod and facing said casing cammember, said cam members being rendered coactively operative only whensaid plunger is positioned at the cam member end of the casing, and saidpush rod comprising means to actuate said plunger over a portion of thelength of said casing during rotation of said plunger cam relative tosaid casing cam by rotation of said push rod with respect to said casingand under certain other fluid pressure conditions.

29. In a fluid pump, a cylinder, a piston carried in said cylinder andaxially movable therein, a piston rod slidably mounted on said cylinderand connected with said piston for bodily reciprocating said pistonwithin sad cylinder, a first cam constructed and arranged for fixedconnection with said cylinder at a given position along the axisthereof, a second coacting cam constructed and arranged for connectionwith said piston and directly movable with said piston toward and away12 from said firstcam, said rod comprising means to actuate said camsinto operative contact within said cylinder, and said cams when incontact comprising rotatively operable means functioning to actuate saidpiston axially within said cylinder when :said piston is rotated withrespect to said cylinder by means of said piston rod.

30. A iiuid pump comprising a cylinder, a piston in said cylinder, arelatively separable radially disposed cam members connected with saidcylinder and piston respectively, rcciprocable means connected with saidpiston to actuate said piston within said cylinder and to causealternate separation and meeting of said cam members, said reciprocablemeans being rotatable relative to said cylinder to operate said cammember when said members i are disposed in meeting contact by saidreciprocable means whereby said piston is selectively cam actuatedwithin said cylinder.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 630,977 Emgarth Aug. 15, 1899 721,023 Cosper Feb. 17, 1903978,265 Barnett Dec. 13, 1910 1,613,147 Wahlstrom Jan. 4, 1927 1,718,985Scoville July 2, 1929 1,739,195 Wheeler Dec. 10, 1929 2,010,679Rosenberry et a1 Aug. 6, 1935 2,436,493 Shepard Feb. 24, 1948

